CVE-2026-27627
XSS to RCE via unchecked Reddit content in Karakeep reader view
Is CVE-2026-27627 being exploited?
Not confirmed. CVE-2026-27627 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.32% probability of exploitation in the next 30 days.
How severe is CVE-2026-27627?
CVE-2026-27627 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-27627?
Yes. A fix has been recorded for CVE-2026-27627. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-27627 affect?
CVE-2026-27627 affects Karakeep Web App (0.30.0). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-27627?
Upgrade to 0.31.0+ to fix sanitization
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Malicious HTML from Reddit can execute in the user's browser via unsafe reader view rendering (dangerouslySetInnerHTML).
Patch when possible
- affected= 0.30.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.